I'm a little new to this processing thing and I'm currently working on a project where I am trying to take a frame, add it to the next frame but have the two frames merge and create a new image based on the blended image of the first 2 frames. Then continue this process indefinitely. (Sorry if that is a bit complicated -> check code for more clarification)

I have tried using a blend() function continually on the image but it seems that you can't save a blend() into a PImage to be used later. 

I have currently written a quick little blend function that returns a blended image but it doesn't seem to be doing the trick. 

Ultimately I hope to have only the brightest pixels make their way to the front of the "accu" PImage. 

Here is my current code:

2. import processing.video.*;
3. 
   
4. Capture cam;
5. boolean testPic = false;
6. 
   
7. PImage addi = createImage(320, 240, ARGB);
8. PImage accu = createImage(320, 240, ARGB);
9. PImage temp = createImage(320, 240, ARGB);
10. 
    
11. int threshold = 20;
12. float vidPixBrite;
13. 
    
14. void setup() {
15.   size(670, 500);
16. 
    
17.   String[] cameras = Capture.list();
18.     
19.     cam = new Capture(this, 320, 240, cameras[0]);
20.     cam.start();
21.     frameRate(24);
22. }
23. 
    
24. void draw() {
25.   if (cam.available() == true) {
26.     
27.     cam.read();
28.     
29.     image(cam, 0, 0);
30.     image(addi, 340, 0);
31.      
32.     cam.loadPixels();   
33.     addi.loadPixels(); 
34.     accu.loadPixels();
35.  
36.    for (int i = 0; i < cam.pixels.length; i++) {  
37.    colorMode(HSB);  
38.    color temp;
39.    temp = color((hue(cam.pixels[i])),(saturation(cam.pixels[i])), (brightness((cam.pixels[i]))-70));
40.    
41.    
42.    if(brightness(addi.pixels[i]) >= (brightness(accu.pixels[i]))){  
43.  
44.    addi.pixels[i] = temp;
45.     }
46.    }
47.    
48.    addi.updatePixels();  
49.    
50.  /*  for(int i=0; i<cam.pixels.length; i++){
51.    
52.     // if(brightness(addi.pixels[i]) > (brightness(accu.pixels[i]))){
53.       accu.pixels[i] = addi.pixels[i];
54.     
55.   // } 
56.    }*/
57.    
58.    temp = lightBlend(addi, accu);
59.    accu = temp;
60.    
61.    accu.updatePixels();
62.     
63.    image(cam, 0, 250);
64.    image(accu, 0, 250);
65.    
66.    accu.blend(cam, 0, 0, 340, 240, 0 , 250, 320, 240, LIGHTEST);
67.   }}
68. //}
69. 
    
70. void keyPressed(){
71.  switch(key){
72.   case 's': accu = clearPixels(accu); break;
73.   
74.  } 
75.   
76. }
77. 
    
78.  PImage clearPixels(PImage p){
79.     
80.    PImage temp = createImage(320, 240, ARGB);
81.    return temp;
82.     
83. }
84. 
    
85. PImage lightBlend(PImage light, PImage bg){
86.   
87.  PImage temp = createImage(light.width, light.height, ARGB);
88.  
89.  temp.loadPixels();
90.  light.loadPixels();
91.  bg.loadPixels();
92.  
93.  for(int i=0; i<temp.pixels.length; i++){
94.    if((brightness(light.pixels[i])) > (brightness(bg.pixels[i]))){
95.      temp.pixels[i] = light.pixels[i];
96.    }else if((brightness(light.pixels[i])) <= (brightness(bg.pixels[i]))){
97.     temp.pixels[i] = bg.pixels[i]; 
98.    }
99.  }
100.  return temp; 
101. }

Any help would be greatly appreciated - or if you have any other criticisms of the code I could use anything at all. Thanks you for your help in advance!